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Alteration of functional connectivity in patients with Alzheimer’s disease revealed by resting-state functional magnetic resonance imaging 预览
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作者 Jie Zhao Yu-Hang Du +2 位作者 Xue-Tong Ding Xue-Hu Wang Guo-Zun Men 《中国神经再生研究:英文版》 SCIE CAS CSCD 2020年第2期285-292,共8页
The main symptom of patients with Alzheimer’s disease is cognitive dysfunction. Alzheimer’s disease is mainly diagnosed based on changes in brain structure. Functional connectivity reflects the synchrony of function... The main symptom of patients with Alzheimer’s disease is cognitive dysfunction. Alzheimer’s disease is mainly diagnosed based on changes in brain structure. Functional connectivity reflects the synchrony of functional activities between non-adjacent brain regions, and changes in functional connectivity appear earlier than those in brain structure. In this study, we detected resting-state functional connectivity changes in patients with Alzheimer’s disease to provide reference evidence for disease prediction. Functional magnetic resonance imaging data from patients with Alzheimer’s disease were used to show whether particular white and gray matter areas had certain functional connectivity patterns and if these patterns changed with disease severity. In nine white and corresponding gray matter regions, correlations of normal cognition, early mild cognitive impairment, and late mild cognitive impairment with blood oxygen level-dependent signal time series were detected. Average correlation coefficient analysis indicated functional connectivity patterns between white and gray matter in the resting state of patients with Alzheimer’s disease. Functional connectivity pattern variation correlated with disease severity, with some regions having relatively strong or weak correlations. We found that the correlation coefficients of five regions were 0.3–0.5 in patients with normal cognition and 0–0.2 in those developing Alzheimer’s disease. Moreover, in the other four regions, the range increased to 0.45–0.7 with increasing cognitive impairment. In some white and gray matter areas, there were specific connectivity patterns. Changes in regional white and gray matter connectivity patterns may be used to predict Alzheimer’s disease;however, detailed information on specific connectivity patterns is needed. All study data were obtained from the Alzheimer’s Disease Neuroimaging Initiative Library of the Image and Data Archive Database. 展开更多
关键词 Alzheimer's disease blood oxygen level-dependent signal correlation coefficient FUNCTIONAL connectivity pattern FUNCTIONAL magnetic resonance imaging GRAY MATTER RESTING state white MATTER
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大麦重组自交系群体籽粒总花色苷含量和千粒重QTL定位 预览
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作者 杨晓梦 李霞 +5 位作者 普晓英 杜娟 Muhammad Kazim Ali 杨加珍 曾亚文 杨涛 《作物学报》 CAS CSCD 北大核心 2020年第1期52-61,共10页
以云南特有的紫色大麦紫光芒裸二棱和澳大利亚引进的黄色大麦Schooner构建的193个重组自交系为材料,对2013-2015年3年3个试验点的大麦籽粒总花色苷含量和千粒重进行相关性分析和QTL定位。大麦总花色苷含量和千粒重之间呈显著或极显著负... 以云南特有的紫色大麦紫光芒裸二棱和澳大利亚引进的黄色大麦Schooner构建的193个重组自交系为材料,对2013-2015年3年3个试验点的大麦籽粒总花色苷含量和千粒重进行相关性分析和QTL定位。大麦总花色苷含量和千粒重之间呈显著或极显著负相关。共检测到12个总花色苷含量QTL,分别位于1H、2H、4H、6H和7H染色体,贡献率为5.06%~23.86%;8个千粒重QTL,分别位于2H、4H和7H染色体,贡献率为4.67%~42.32%。贡献率大于10%的QTL有10个,大于20%的有5个,最大的可达42.32%。其中至少2年2点重复检测到2个总花色苷含量QTL,分别位于2H Bmag0125–GBM1309和7H EBmatc0016–Bmag0206区间,可分别解释表型变异的13.66%~17.76%和13.07%~16.43%;3年3点重复检测到2个千粒重QTL,分别位于2HScssr03381–scssr07759和7H GBM1297-GBM1303区间,可分别解释表型变异的4.67%~14.55%和34.51%~42.32%,其加性作用方向均一致。控制总花色苷含量与千粒重的主效QTL同位于2H和7H染色体。 展开更多
关键词 大麦重组自交系 总花色苷含量 千粒重 相关性 QTL定位
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成人无症状前凸型颈椎矢状面平衡影像学参数的相关性特征 预览
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作者 曹斌 左玉强 +3 位作者 李存瑞 康伟峰 于海泉 苏敬阳 《中国组织工程研究》 CAS 北大核心 2020年第6期898-902,共5页
背景:正常的颈椎矢状面平衡是颈椎矫形手术的关键。由于颈椎解剖结构和生理功能的复杂性,故对颈椎矢状面平衡参数的准确测量及参数间相关性成为制定手术方案及评价疗效的重要参考,现有研究集中在有临床症状的颈椎病患者。目的:探讨成人... 背景:正常的颈椎矢状面平衡是颈椎矫形手术的关键。由于颈椎解剖结构和生理功能的复杂性,故对颈椎矢状面平衡参数的准确测量及参数间相关性成为制定手术方案及评价疗效的重要参考,现有研究集中在有临床症状的颈椎病患者。目的:探讨成人无症状前凸型颈椎矢状面平衡影像学参数相关性。方法:回顾性分析120例成人无症状前凸型颈椎正侧位DR影像,根据研究对象年龄将其分为3组,A组(21-40岁)、B组(41-60岁)、C组(61-80岁),测量其颈椎矢状面平衡影像学参数,包括C2-C7矢状面轴向垂直距离(C2-C7 sagittal vertical axis,C2-C7 SVA)、头部重心到C7矢状面轴向垂直距离(central of gravity to C7 sagittal vertical axis,CG-C7 SVA)、T1倾斜角、C0-C2 Cobb角及C2-C7 Cobb角,分析组间影像学参数差异及不同影像学参数与年龄间相关性。研究通过石家庄市第一医院、河北医科大学第二医院伦理委员会批准,纳入者均签署知情同意书。结果与结论:(1)不同年龄组的C2-C7 SVA(F=11.188,P<0.001)、CG-C7 SVA(F=6.132,P=0.003)、T1倾斜角(F=11.682,P<0.001)组间比较差异均有统计学意义,C0-C2 Cobb角(F=1.178,P=0.311)、C2-C7Cobb角(F=0.860,P=0.426)组间比较差异无统计学意义;(2)A、B、C组的T1倾斜角分别为(51.63±5.85)°,(54.66±5.58)°,(57.48±4.74)°,线性相关分析显示T1倾斜角与年龄呈正相关(r=0.533,P<0.001);另T1倾斜角和C2-C7 Cobb角间存在正相关(r=0.561,P<0.001)。提示:在成人无症状前凸型颈椎者中,T1倾斜角有随着年龄增大而增大的趋势,且T1倾斜角与年龄呈正相关。 展开更多
关键词 颈椎 矢状面平衡 影像学 相关性
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Document Analysis of Correlation between Climate and Stroke 预览
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作者 Hongwei Li Yonggang Qian +17 位作者 Shubi Wang Hairong Zhang Wenfang Gou Mingzhu Niu Di Yu Ruijie Wu Liqun Gao Baofeng Chi Qingxia Wang Wenli Hao Wuyuntana Li Tao Yan Liwei Niu Yan Liu Jing Zhao Yuan Jin Maolin Du Juan Sun 《流行病学期刊(英文)》 2019年第1期82-88,共7页
Aim: The aim of the research is to determine characteristic of the correlation between climate and stroke through the analysis of relevant documents. Methods: We found 115 researches of temperature and season on strok... Aim: The aim of the research is to determine characteristic of the correlation between climate and stroke through the analysis of relevant documents. Methods: We found 115 researches of temperature and season on stroke mortality/incidence and these were categorized according to location, meteorology, date span, data source and research sites’ latitudes. We divided the globe into 5 temperature zones based on latitude ranges: 0 - 10, 10 - 23.5, 23.5 - 40, 40 - 50, and >50 degrees, and allotted a zone to each country. Stroke mortality by five temperature zones was calculated per 100,000 people. Results: 70% of the researches came from latitudes greater than 40 degrees with 92% of researches located in Europe, USA, and Asia. The mortality range was 42 - 63 per 105 individuals within latitudes 0 - 40 degrees. In latitudes 40 - 66.5 degrees, a linear upward trend (y = 69.82x &#8722;22.823, R2 = 0.99) was noticed. More than 75% of the research reports indicated a negative correlation between climate and stroke, and the proportion was almost 6 and 7 times greater than that of the fluctuation and non-correlation, respectively. The most frequently used research methods were regression analysis and time series analysis. Conclusion: All of the research results confirmed that lower temperature is associated with higher mortality and incidence of stroke, while higher latitude is correlated with higher stroke mortality, consistent with the temperature zones. 展开更多
关键词 CLIMATE STROKE CORRELATION
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Sonographic Measurement of Optic Nerve Sheath Diameter: A Prognostic Tool for Childhood Cerebral Malaria? 预览
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作者 Kofi-Mensa Savi de Tové Yolande Savi de Tové-Sissinto +6 位作者 Didier Julien Adedemy Djivèdé Akanni Miralda Kiki Patricia Yèkpè-Ahouansou Olivier Biaou Vicentia Boco Achille Massougbodji 《放射学期刊(英文)》 2019年第1期69-81,共13页
Background: Childhood cerebral malaria is one of the most frequent complications of malaria, with high morbidity and mortality. Raised Intracranial Pressure (ICP) is currently recognized as a fundamental element of th... Background: Childhood cerebral malaria is one of the most frequent complications of malaria, with high morbidity and mortality. Raised Intracranial Pressure (ICP) is currently recognized as a fundamental element of the severity of that disease. This study aims to look into the prognostic role of the sonographic measurement of optic nerve sheath diameter (ONSD) in the context of that disease. Methods: This study was conducted in the pediatric and imaging departments of the University Hospital Center of Parakou in Republic of Benin in West Africa. This was a descriptive cross-sectional study with a prospective data collection conducted over a period of 6 months, from March 1st to August 31st, 2014. There were two groups of children with severe malaria and conscious impairment: one with unrousable coma or Cerebral Malaria (Group 1) and the other without unrousable coma (Group 2), benefitting from ONSD sonographic measurement. ONSD was measured 3 mm behind the papilla. Correlation between depth of coma, outcome and ONSD measure on ultrasound was investigated. Results: Group 1 consisted of 37 children and Group 2 of 50 children, i.e. a sample of 87 children. The mean age was 27.21 ± 20.11 months and sex ratio (Male/Female) estimated at 0.89. The average ONSD of the sample was 4.39 ± 0.94 mm with a significant difference (p = 0.0001) between Group 1 (5.09 ± 1.09 mm) and Group 2 (3.87 ± 0.17 mm). Raised ICP prevalence was 48.28% with a significant difference between Group 1 (83.78%) and Group 2 (22%) with p Conclusion: Sonographic measurement of ONSD could be a leading prognostic tool in childhood cerebral malaria management. 展开更多
关键词 Cerebral MALARIA Ultrasound OPTIC Nerve SHEATH Diameter Prognosis Correlation
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Energy-Efficient MTC Data Offloading in Wireless Networks Based on K-Means Grouping Technique 预览
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作者 Juma Saidi Ally Muhammad Asif Qingli Ma 《电脑和通信(英文)》 2019年第2期47-61,共15页
Machine-type communication (MTC) devices provide a broad range of data collection especially on the massive data generated environments such as urban, industrials and event-enabled areas. In dense deployments, the dat... Machine-type communication (MTC) devices provide a broad range of data collection especially on the massive data generated environments such as urban, industrials and event-enabled areas. In dense deployments, the data collected at the closest locations between the MTC devices are spatially correlated. In this paper, we propose a k-means grouping technique to combine all MTC devices based on spatially correlated. The MTC devices collect the data on the event-based area and then transmit to the centralized aggregator for processing and computing. With the limitation of computational resources at the centralized aggregator, some grouped MTC devices data offloaded to the nearby base station collocated with the mobile edge-computing server. As a sensing capability adopted on MTC devices, we use a power exponential function model to compute a correlation coefficient existing between the MTC devices. Based on this framework, we compare the energy consumption when all data processed locally at centralized aggregator or offloaded at mobile edge computing server with optimal solution obtained by the brute force method. Then, the simulation results revealed that the proposed k-means grouping technique reduce the energy consumption at centralized aggregator while satisfying the required completion time. 展开更多
关键词 Machine-Type Communication Correlation DATA OFFLOADING GROUPING TECHNIQUE Differential Entropy Power Exponential Function
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New Tympanic Membrane Temperature Shows Good Correlation with the Esophageal Temperature <br/>—Accuracy of a Noncontact Continuous Tympanic Thermometer 预览
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作者 Yosuke Tamasaki Hironobu Ueshima +2 位作者 Sakatoshi Yoshiyama Satoshi Higuchi Hiroshi Otake 《麻醉学期刊(英文)》 2019年第4期51-56,共6页
Background: An ear-fitting thermometer probe “NIPRO CE THERMO?” (Nipro Corporation, Osaka, Japan, new CE thermo) for both ears was newly developed in 2017. Since new release, we have never investigated about an accu... Background: An ear-fitting thermometer probe “NIPRO CE THERMO?” (Nipro Corporation, Osaka, Japan, new CE thermo) for both ears was newly developed in 2017. Since new release, we have never investigated about an accuracy of the new CE thermo. In this time, the accuracy of the CE thermo was investigated. Methods: The correlation between the tympanic membrane temperature, measured using the new CE thermo, and the esophageal temperature of 30 patients (right ear: 16 patients, left ear: 14 patients) was measured in the prospective observational study. Results: A good correlation (r = 0.721) and no measurement error (within 1?C in mean ± 2SD) between the two temperatures were observed using Bland-Altman analysis. The correlation and measurement error for each ear yielded the same results. Conclusion: The tympanic membrane temperature, measured using the new CE thermo, showed good correlation with the esophageal temperature and could be used as a central temperature in the perioperative period. 展开更多
关键词 Tympanic Membrane TEMPERATURE ESOPHAGEAL TEMPERATURE CORRELATION Measurement Error
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A Brief Study on Using pH<sub>H<sub>2</sub>O</sub>to Predict pH<sub>KCl</sub>for Acid Soils 预览
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作者 Anqi Wang Decheng Li +1 位作者 Biao Huang Yin Lu 《农业科学(英文)》 2019年第2期142-149,共8页
pHKCl and pHH2O are two basic necessary indexes to reflect the acidity of asoil. Predicting pHKCl?directly from pHH2O?could save the cost of laboratory work. In this study, the values of pHKCl and of 442 and 310 horiz... pHKCl and pHH2O are two basic necessary indexes to reflect the acidity of asoil. Predicting pHKCl?directly from pHH2O?could save the cost of laboratory work. In this study, the values of pHKCl and of 442 and 310 horizon samples from 126 and 98 soil profiles (0 - 120 cm in depth) surveyed from 2014 to 2015 in Guangxi and Yunnan were used to establish the optimal correlation model between pHKCl and pHH2O. The results showed that: 1) pHKCl is lower than pHH2O, pHKCl?was 0.07 - 1.99 units with a mean of 0.99 units lower than for Guangxi, while 0.03 - 1.90 units with a mean of 0.89 lower than pHH2O?for Yunan. 2) There is significant positive correlation between pHKCl?and pHH2O, the optimal correlation models between pHKCl?(y) and pHH2O?(x) for Guangxi and Yunnan are y = 0.1963x2 &minus;1.0512x + 4.338, R2 = 0.836, p 0.1859x, R2 = 0.769, p pHKCl?with exchangeable H+ and Al3+ (R2 = 0.487, 0.716, p pHKCl?is dominated by exchangeable Al3+, followed by exchangeable H+, and their contribution to pHKCl?were 71.1% and 28.7%, respectively. 展开更多
关键词 Predicting Model pHKCl pHH2O CORRELATION Influential Factors Acid Soil
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Occurrence of Fluoride in the Groundwater of Kaltungo Area and Environs, North Eastern Nigeria 预览
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作者 Shehu Mukkafa Jackson Makpane Ishaku +5 位作者 Ibrahim Abdulkarim Kwami Ahmed Buba Seli Usman Adamu Abubakar Abdulwahab Mohammed Bello Usman Abubakar Musa Usman Bappa 《地球科学和环境保护期刊(英文)》 2019年第8期167-179,共13页
The aim of the study is to assess the occurrence of fluoride in the groundwater of Kaltungo area and environs. Consumption of high fluoride waters clearly manifests in the majority inhabitant of the area in form of de... The aim of the study is to assess the occurrence of fluoride in the groundwater of Kaltungo area and environs. Consumption of high fluoride waters clearly manifests in the majority inhabitant of the area in form of dental fluorosis especially in the majority of the populace. Thirty groundwater samples were collected from hand-dug wells and boreholes using standard method and were analyzed to determine the fluoride level. The results revealed that the Fluoride in the waters ranges from 0.8 to 1.94 mg/l with a mean value of 1.65 mg/l. No clear variations in fluoride content have been observed in both the borehole samples and those from the hand-dug wells. Ca-Mg-HCO3 and Ca-Mg-Cl are the two major water types obtained in the area, which have a good association with fluoride. Negative correlation is observed between fluoride and temperature, fluoride and magnesium, fluoride and potassium and poor correlation is observed between fluoride and chloride, fluoride and nitrate, fluoride and phosphates which rules out the possibility of anthropogenic source of the fluoride in the waters. Positive correlation between fluoride and iron, indicates that the presence of fluoride in the water is as a result of dissolution of biotite within the host rock (Basalt). 展开更多
关键词 ANTHROPOGENIC Correlation FLUORIDE Kaltungo
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延安市某医院环境卫生监测合格率与医院感染率相关性分析 预览
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作者 张丽霞 贺淼 +2 位作者 蔺广东 董小波 朱京海 《医学与社会》 北大核心 2019年第11期44-47,52,共5页
目的:了解延安市某医院环境卫生监测合格率与医院感染率的相关性,探究环境因素对医院感染率的影响强弱程度。方法:采用回顾性分析法与灰色关联分析法对延安市某医院2011-2016年环境卫生监测合格率与医院感染率进行统计分析。结果:该医院... 目的:了解延安市某医院环境卫生监测合格率与医院感染率的相关性,探究环境因素对医院感染率的影响强弱程度。方法:采用回顾性分析法与灰色关联分析法对延安市某医院2011-2016年环境卫生监测合格率与医院感染率进行统计分析。结果:该医院2011-2016年环境卫生监测合格率分别为99.08%、99.58%、99.68%、99.70%、100%、100%;医院感染率分别为0.67%、0.52%、0.41%、0.36%、0.30%、0.39%,二者之间具有明显相关性(r=-0.899,P=0.015)。影响医院感染率的因素其关联程度由强到弱依次为:使用中的消毒剂合格率>空气合格率=物体表面合格率>医务人员手合格率。结论:环境卫生监测合格率与医院感染率之间存在统计学意义,灰色关联分析法分析医院感染率的影响因素结果可靠,简单易行。 展开更多
关键词 医院环境卫生监测 医院感染 相关性 灰色关联分析 延安
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Review on partially coherent vortex beams
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作者 Jun ZENG Rong LIN +2 位作者 Xianlong LIU Chengliang ZHAO Yangjian CAI 《中国光电子学前沿:英文版》 EI CSCD 2019年第3期229-248,共20页
Ever since vortex beams were proposed, they are known for owning phase singularity and carrying orbital angular momentum (OAM). In the past decades, coherent optics developed rapidly. Vortex beams have been extended f... Ever since vortex beams were proposed, they are known for owning phase singularity and carrying orbital angular momentum (OAM). In the past decades, coherent optics developed rapidly. Vortex beams have been extended from fully coherent light to partially coherent light, from scalar light to vector light, from integral topological charge (TC) to fractional TC. Partially coherent vortex beams have attracted tremendous interest due to their hidden correlation singularity and unique propagation properties (e.g., beam shaping, beam rotation and self-reconstruction). Based on the sufficient condition for devising a genuine correlation function of partially coherent beam, partially coherent vortex beams with nonconventional correlation functions (i.e., non-Gaussian correlated Schell-model functions) were introduced recently. This timely review summarizes basic concepts, theoretical models, generation and propagation of partially coherent vortex beams. 展开更多
关键词 PARTIALLY coherent VORTEX beam phase SINGULARITY CORRELATION SINGULARITY TOPOLOGICAL charge (TC) COHERENCE length CORRELATION function
不同辐射对土壤湿度长程相关性的影响——以黑河流域阿柔超级站为例
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作者 张婷 沈石 程昌秀 《地理学报:英文版》 SCIE CSCD 2019年第9期1491-1506,共16页
Analyses of the soil moisture evolution trend and the influence of different types of radiation on soil moisture are of great significance to the simulation and prediction of soil moisture.In this paper,soil moisture(... Analyses of the soil moisture evolution trend and the influence of different types of radiation on soil moisture are of great significance to the simulation and prediction of soil moisture.In this paper,soil moisture(2–60 cm) and various radiation data from 2014–2015 at the A’rou superstation were selected.The radiation data include the net radiation(NR),shortwave and longwave radiation(SR and LR).Using adaptive fractal analysis(AFA),the long-range correlation(LRC) of soil moisture and long-range cross correlation(LRCC) between moisture and three types of radiation were analyzed at different timescales and soil depths.The results show that:(1) Persistence of soil moisture and consistency between soil moisture and radiation mutate at 18-d and 6-d timescales,respectively.The timescale variation of soil moisture persistence is mainly related to the influence process of radiation on soil moisture;(2) Both the soil moisture persistence and soil moisture-radiation consistency vary substantially with soil depth.The soil depth variation of soil moisture persistence is related to the influence intensity of radiation;(3) From 2–6 day timescales,LR displays the strongest influence on soil moisture at depths of 2–10 cm through negative feedback of radiation on the soil temperature.The influence intensity decreases with depth from 2–15 cm.Therefore,the soil moisture persistence is weak and increases with depth from 2–15 cm;and(4) At more than 6 day timescales,SR and NR display a stronger influence on the soil moisture persistence at depths of 2–40 cm through positive feedback of radiation on the soil temperature,especially at depths of 2–10 cm.This influence also weakens with depth.The soil moisture persistence at depths of 2–10 cm is the weakest and increases with depth from 2–40 cm.The research results are instructive for determining timescales and soil depths related to soil water in hydrological models. 展开更多
关键词 soil MOISTURE radiation LONG-RANGE CORRELATION LONG-RANGE cross CORRELATION adaptive FRACTAL analysis
Evaluation of Correlation between Acid Degree Value and Peroxide Value in Lipolysis of Control and Iron Fortified Caprine Milk Cheeses during 4 Months Storage 预览
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作者 Aftab Siddique Young W. Park 《动物科学期刊(英文)》 2019年第1期1-11,共11页
Elevation of acid degree values (ADV) and peroxide value (POV) indicates deterioration of nutritional and sensory qualities of dairy products during storage. Iron fortification in bovine milk cheeses in relation to li... Elevation of acid degree values (ADV) and peroxide value (POV) indicates deterioration of nutritional and sensory qualities of dairy products during storage. Iron fortification in bovine milk cheeses in relation to lipolytic parameters and their correlations have been studied, while no such studies have been reported on caprine milk cheeses. The objectives of this study were to evaluate levels of ADV and POV of iron fortified [regular ferrous sulfate (RFS) and large microencapsulated ferrous sulfate (LMFS)] goat milk Cheddar cheeses compared to those of non-fortified control cheese (CC) and their correlations. Three batches of 3 types (CC, RFS and LMFS added) of goat milk cheeses were manufactured and stored at two temperatures (4&deg;C and -18&deg;C) for 0, 2 and 4 months. Iron was supplemented to RFS and LMFS cheeses by 8.23 g and 9.03 g per 9 kg, respectively. ADV and POV were determined using standard methods of examining dairy products (Richardson, 1985) and AOCS (1975) procedures. Results showed that ADV values for CC, RFS and LMFS cheeses for 0 and 4 month storage at 4&deg;C were: 0.67, 0.73, 0.64;1.24, 1.78, 1.58, respectively, indicating significant (P < 0.05) elevations occurred in ADV for all three cheeses during 4 months storage. The cheese samples at 4 months storage showed significantly (P < 0.05) higher peroxide values compared to 0 and 2 month stored ones. The samples stored at refrigeration temperature (4&deg;C) revealed slightly more lipid oxidation than those stored at frozen temperature (-18&deg;C). Significant (P < 0.05) elevations in POV for all goat cheeses stored for 4 months and slight increases in POV at higher temperature implies that the longer time and higher temperature storage can elevate the rate of lipid oxidation in goat milk Cheddar cheeses. Correlations (r) between ADV and POV for the pooled data of three types of the caprine cheeses across storage periods were significant (P < 0.01), while r values of CC cheeses alone were negative. It was concluded that significant correlatio 展开更多
关键词 CAPRINE Milk Cheese STORAGE IRON Fortification ADV POV CORRELATION
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Dynamics of 18 (<i>Sophora japonica</i>) Tree Community’s Crown Volume along Elevation Gradient in <i>Ye County</i> 预览
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作者 Binghua Liao Yingping Liu +6 位作者 Hai Zuo Junrong Xia Zuyun Yu Changjian Song Xiaoguang Zhang Caige Jiang Yalong Xu 《生态学期刊(英文)》 2019年第7期209-215,共7页
Applying plant community diversity techniques and SPSS statistic analysis, we quantified the relationship between crown volume of 18 (Sophora japonica) tree communities and elevation along different elevation gradient... Applying plant community diversity techniques and SPSS statistic analysis, we quantified the relationship between crown volume of 18 (Sophora japonica) tree communities and elevation along different elevation gradient in Ye County in the study. We concluded that there was a significantly positive correlation between crown volume of 18 (Sophora japonica) tree communities and elevation gradient (P Sophora japonica) tree communities increased along elevation from 50 m to 200 m in Ye County in 2018. Therefore, understanding dynamic connecting crown volume of 18 (Sophora japonica) communities and elevation can be not just applied to preserve of (Sophora japonica) tree communities, but also applied to sustainable of biodiversity and processes of tree community’s crown volume along elevation. 展开更多
关键词 (Sophora japonica) Communities CROWN VOLUME Elevation Gradient Correlation International Pharmaceutical Materials
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Spatial Analysis of Soybean Plant Height and Plant Canopy Temperature Measured with On-the-Go Tractor Mounted Sensors 预览
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作者 Reginald S. Fletcher Daniel K. Fisher 《农业科学(英文)》 2019年第11期1486-1496,共11页
There is a growing interest in the Open Ag community to use inexpensive sensors controlled by open-source software to measure plant height and plant canopy temperature of agricultural crops. Plant height and plant can... There is a growing interest in the Open Ag community to use inexpensive sensors controlled by open-source software to measure plant height and plant canopy temperature of agricultural crops. Plant height and plant canopy temperature are key indicators of plant health. This research study reports on an ongoing research initiative to test a compact and inexpensive mobile sensor to measure plant height and plant canopy temperature. The system is controlled by open source software and hardware. The specific objectives for this study were to analyze the relationship between plant height and plant canopy temperature of soybeans (Glycine max L.) measured with the mobile system and to analyze the spatial correlation of the plant height and plant canopy temperature measurements. Data were collected in a soybean plot in 2018 and 2019. Descriptive statistics, Pearson correlation, and geostatistical techniques were used to evaluate the data. A negative statistically significant (p ≤ 0.05) relationship was observed between the plant height and the plant canopy temperature measurements (r = &#8722;0.54, 2018;r = &#8722;0.37, 2019). Also, both parameters were spatially correlated;however, plant height had a greater spatial continuity than plant canopy temperature. Furthermore, similar patterns were observed for the in-field variability of the plant height and plant temperature maps derived via kriging. Similarities in plant height and plant canopy temperatures were observed from one year to the next, suggesting that the sensor technologies could be used as a historical record for monitoring growth patterns in soybean fields. The sensors and techniques used in this study can be easily adapted to other crops, thus providing two important layers for monitoring plant growth and potentially plant stress. 展开更多
关键词 GLYCINE max Ultrasonic SENSORS Infrared THERMOMETER Correlation In-Field Variability
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Correlation between Mode of Delivery and Newborn’s Cord Blood Composition 预览
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作者 Abd El-Naser Abd El-Gaber Ali Ahmed Mustafa Mahmoud 《妇产科期刊(英文)》 2019年第3期395-403,共9页
OBJECTIVE: The aim of this study is to find out the effect of delivery mode on newborn’s cord blood parameters particularly hemoglobin and hematocrite values. SETTING: Obstetrics and Gynecology Department, Qena Facul... OBJECTIVE: The aim of this study is to find out the effect of delivery mode on newborn’s cord blood parameters particularly hemoglobin and hematocrite values. SETTING: Obstetrics and Gynecology Department, Qena Faculty of Medicine, South Valley University, Egypt. DURATION: From April 2015 to December 2017. STUDY DESIGN: A cross sectional study. METHODS: 900 live born neonates for healthy mothers were included in this study;all cases were delivered at full-term, with birth weight ranged from 2.5 to 3.5 Kg and had APGAR scores above 7 at 1 and 5 minutes. Newborns were divided into three groups (Group I included 300 newborns delivered by vaginal delivery without augmentation of labor, Group II included 300 newborns delivered vaginally with augmentation of labor and Group III included 300 newborns delivered by elective cesarean section). Blood sample was collected from the umbilical vein of each neonate for estimation of hemoglobin, hematocrit, RBCs count, platelets, WBCs count and reticulocytes. RESULTS: Cesarean section delivery had a statistically significant decrease in the level of iron-related hematologic indices including hemoglobin, hematocrit and RBCs count (p value < 0.001). There was a statistically significant difference among studied groups in reticulocyte count with (P value a positive correlation among newborns cord blood hemoglobin as regard to head circumference, length and gestational age and negative correlations as regard to maternal age, parity and birth weight with no statistically significance (P value > 0.05). CONCLUSIONS: Cesarean section delivery had a significant decrease in the level of iron-related hematologic indices including hemoglobin, hematocrit and RBCs count and has a non-significant decrease in WBCs and platelets counts in neonatal cord blood, which suggest high prevalence of newborn iron-deficiency anemia among cesarean births particularly in developing communities. 展开更多
关键词 CORRELATION Mode of Delivery NEWBORN CORD Blood COMPOSITION
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Crystallization Behavior of Poly(Tetramethylene Oxide) Influenced by the Crystallization Condition of Poly(Butylene Succinate) in Their Copolymers
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作者 HUANG Yong LIU Junhong +1 位作者 ZHANG Aimin ZHOU Tao 《武汉理工大学学报:材料科学英文版》 SCIE EI CAS 2019年第2期496-506,共11页
The effect of crystallization conditions of poly(butylene succinate)(PBS) component on the crystallization of poly(tetramethylene oxide)(PTMO) component in their segment block copolymer, with a higher PTMO content(PTM... The effect of crystallization conditions of poly(butylene succinate)(PBS) component on the crystallization of poly(tetramethylene oxide)(PTMO) component in their segment block copolymer, with a higher PTMO content(PTMO mass fraction is 67%), was investigated by DSC and temperature-dependent FTIR. It is found that the isothermal crystallization time(tIC) of PBS has an effect on the crystallization behavior of PTMO component. Perturbation correlation move-window two-dimensional(PCMW2 D) correlation analysis and generalized 2 D correlation analysis(2 DIR) were performed to explore the origin of this phenomenon. The PCMW2 D and 2 DIR results show that the correlation intensity peak observed at around 20 ℃ for PTMO is due to the PTMO chains movements forced by the PBS chains folded movements. If tIC of PBS at temperature of 20 ℃ is prolonged, more PTMO components are incorporated in the region between PBS lamellae and the peak at-7.6 ℃(belonging to less-constricted PTMO chains) changes smaller and even disappears, while the peak at-16.3 ℃ belonging to more-constricted PTMO chains gets bigger. A crystallization model was also established in this study. The results of tensile testing showed that tensile strength slightly increased and elongation at break decreased with increasing heat treatment time at 40 ℃. 展开更多
关键词 PBS/PTMO segment block copolymer CRYSTALLIZATION behavior perturbation CORRELATION move-window two-dimensional CORRELATION analysis
批判性思维与外科仿真模拟训练技能评价的相关性研究
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作者 张凡帆 张少辉 +8 位作者 刘宝清 王辉 陈颖 裴文婧 代宏亮 安佳琳 陈子彦 东潇博 杨成城 《中医教育》 2019年第3期52-57,共6页
目的评价研究生批判性思维与外科仿真模拟训练客观结构化技能评价结果是否存在相关性。方法对3个年级共计197名在读硕士研究生进行批判性思维的调查,并在16个学时的外科仿真模拟训练结束后进行客观结构化技能评价,了解学生批判性思维不... 目的评价研究生批判性思维与外科仿真模拟训练客观结构化技能评价结果是否存在相关性。方法对3个年级共计197名在读硕士研究生进行批判性思维的调查,并在16个学时的外科仿真模拟训练结束后进行客观结构化技能评价,了解学生批判性思维不同维度及总分与客观结构化技能评价结局之间是否有相关性。结果 197名学生批判性思维,在不同性别之间有差异,维度4、5与年龄相关。维度1至维度6与多站式考核结果相关,维度7及总成绩与考核结果未见相关;批判性思维各部分与OSATS未见明显相关。结论批判性思维与外科仿真模拟训练结果之间有一定的相关性。培养和激发学生的批判性思维,能激发中医本科生对外科操作技能的学习兴趣,结合仿真模拟训练,对规范外科基本技术的培养与能力提升有明显效果。 展开更多
关键词 仿真模拟训练 客观结构化技能评价 外科基本技能考核 批判性思维 相关性
CHI3L1基因与支气管哮喘相关性的研究 预览
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作者 李秀洪 林娜 《右江医学》 2019年第4期241-244,共4页
支气管哮喘是由环境因素和基因因素相互影响的一种多基因遗传病,其具有明显的家族遗传倾向,因此有关哮喘遗传基因的研究成为热点。CHI3L1基因为近年来新发现的与哮喘相关的一种基因,其编码蛋白为YKL-40,二者参与哮喘发病机制。该文将对C... 支气管哮喘是由环境因素和基因因素相互影响的一种多基因遗传病,其具有明显的家族遗传倾向,因此有关哮喘遗传基因的研究成为热点。CHI3L1基因为近年来新发现的与哮喘相关的一种基因,其编码蛋白为YKL-40,二者参与哮喘发病机制。该文将对CHI3L1基因的结构、多态性及其编码蛋白与哮喘的关系作一综述。 展开更多
关键词 CHI3L1 基因 哮喘 相关性
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冠状动脉狭窄程度与冠心病危险因素的相关性分析 预览
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作者 张轩 《世界复合医学》 2019年第4期38-40,共3页
目的研究探讨冠状动脉狭窄程度与冠心病危险因素的相关性分析。方法选取2016年1月—2018年10月期间至医院接受治疗的68例行冠脉造影的疑似冠心病患者作为观察对象,对所有患者进行首次行冠脉造影,根据造影结果将患者分为研究组与对照组,... 目的研究探讨冠状动脉狭窄程度与冠心病危险因素的相关性分析。方法选取2016年1月—2018年10月期间至医院接受治疗的68例行冠脉造影的疑似冠心病患者作为观察对象,对所有患者进行首次行冠脉造影,根据造影结果将患者分为研究组与对照组,各34例。研究组患者造影结果显示为冠心病,对照组患者的造影结果显示为非冠心病。比较两组患者的性别、年龄、血脂、肥胖程度、是否吸烟等一般资料,同时统计并比较冠心病的影响因素。结果研究组患者年龄(63.82±8.73)岁高于对照组(t=2.84,P<0.05),男性比例76.47%、肥胖比例32.35%、高血压比例75.53%、糖尿病比例35.29%、血脂异常比例32.35%、吸烟比例44.12%高于对照组(χ^2=5.12,4.19,6.07,6.93,5.76,5.20,P<0.05),年龄、性别、肥胖程度、血脂水平、糖尿病、高血压、是否吸烟均为冠心病的危险因素,Gensini评分中年龄70岁以上(51.42±11.73)分、男性(43.85±16.91)分、伴有高血压(54.83±16.27)分、肥胖(34.81±8.81)分、血脂异常(43.17±8.92)分、伴有糖尿病(53.72±15.64)分和有吸烟史(46.27±12.75)分得分较高(t=5.80,2.37,3.96,4.13,4.21,4.90,2.17,P<0.05)。结论冠心病的危险因素主要有性别、肥胖、血脂水平、糖尿病及是否具有吸烟史,将上述威胁因素综合的冠心病患者其冠状动脉更加狭窄,在临床治疗中应对冠状动脉狭窄状况加以重视。 展开更多
关键词 冠状动脉狭窄程度 冠心病危险因素 相关性
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